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(No Model.)

J. B. G, A. (JANET. POINTING ORLAYING GUNS.

Patented Apr. 22. 1890.

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JEAN BAPTISTE GUSTAVE ADOLPHE OANET, OF PARIS, FRANCE, ASSIGNOR I OF ONF-HALF TO SIR JOSEPH IVHITIVORTII & COMPANY, (LIMITED,) OF

OPENSHAIV, ENGLAND.

POINTING ORiLAYING GUNS.

SPECIFICATION forming part of Letters Patent No. 426,239, dated April 22, 1890.

Application filed April 2, 1889. Serial No. 305,727. (No modelJt T aZZ whom it may concern.-

Be it known that I, JEAN BAPTISTE GUS-- TAVE ADOLPHE OANET, civil engineer, a citizen of the Republic of France, and a resident of Paris, France, have invented certain new i and useful Improvements in Apparatus for Pointing or Laying Guns, (for which I have: obtained patents in the following countries: Great Britain, No. 9,373, dated July 1, 1887; France, No. 178,422, dated September 9, 1886, f and No. 184,518, dated June 29, 1887, which invention was included in the specification accompanying my application for Letters Patent of the United States filed August 21, 1888, No. 283,390,) of which invention the following is a specification, reference being had to the accompanying drawings.

My invention relates to apparatus for pointing or laying guns.

The main feature of my said invention con- 1 sists in the combination of spur-gearing and worm-gearing worked by the same hand-wheel or crank-handle and operating simultaneously for efiecting the vertical pointing or elevation of the gun.

The said invention, moreover, comprises improvements in the details of construction of the elevating mechanism.

In the accompanying drawings I have shown how my said invention may be conveniently and advantageously carried into practice.

Figure 1 is a side elevation of a portion of a gun-mounting with my present improvements applied thereto, some of the parts being removed. Fig. 2 is a transverse section 011 the line 000:, Fig. 1.

A indicates a part of the platform, turntable, or under carriage carrying the chassis or slide A.

B is the cradle or top carriage, in which the gun is supported by its trunnions, and which recoils with the gun upon the said chassis or slide A against the resistance of suitable brakes.

a is a horizontal shaft mounted in bearings a in the cradle or top carriage B, and having fixed upon it a pinion b, geared either directly arc (Z, fixed on the gun.

Patented in France September 9, 1886, No. 178,422, and June and in England July 1,1887,N0.9,373-

' or through the medium of one or more toothed gmental rack or elevating- On the said shaft a is mounted a worm-wheel c and a spur-wheel formed therewith or firmly attached thereto. A worm g, fixed on a vertical shaft h, is geared with the Worm-wheel e. The shaft h is supported by a suitable bearing h, formed with or attached to the cradle B, and is connected by means of bevel-wheelsj with a horizontal shaft Z, which is carried in bearings Z, also formed with or attached to the 60 cradle B. The said shaft l is provided with a hand-wheel m or other suitable device for rotating it. On the shaft Z is also fixed a pinion at, which is geared with the spur-wheel f.

The worm-wheel e and spur-wheel f are not 6 5 keyed upon the shaft ct, but are connected therewith by means of friction-cones 0, which work 011 feathers or keys fixed in the said shaft a, so that they are free to slide along the shaft, but must turn therewith. Lock- 7o nuts to are provided for forcing and locking the cones together with any required degree of pressure and so regulating the friction or adherence between the said cones and the wheels 0 with a se wheels 6 f. Other suitable means, however,

may be employed to lock the said cones.

By the abovedescribed mode of construction the turning of the gun about its trunnions for elevation or vertical pointing is effected by two sets or trains of gearing-that 8c is to say, by the spur-gearing comprising the wheels or f and by the worm-gearing comprising the worm g and worm-wheel e through the medium of the bevel-wheels j 70. In order that the gearing, as described, may work together, the number of teeth in the several wheels must be so arranged that the shaft a will be rotated at the same speed by both sets or trains of gearing.

The gearing may be conveniently proporo tioned as follows, viz: The pinion a may have, say, ten teeth and the wheel f forty teeth, so that one rotation of the shaft a will be caused by every four revolutions of the shaft Z, and the bevel-wheels j is would then 5 have twenty teeth and ten teeth, respectively, the worm-wheel f sixteen teeth, the worm g being a double worm-that is to say, a worm having two screw-threads-so that the wormgearing would also give one rotation of the shaft a for every four revolutions of the shaft Z.

The employment of spur-gearing is on the one hand a very advantageous mode of providing for the vertical pointing or elevation of a gun, but it is not adapted to resist any movement due to the turning of the gun upon or about its trunnions by the force of the explosion. On the other hand, wormgearing is very effective in resisting such movement of the elevating-gear by the gun by reason of the difficulty of driving the wormby means of the worm-wheel. In the above-described mode of construction, therefore, the advantages of both kinds of gear are combined and the disadvantages of each kind of gear when used separately are obviated.

Under the influence of any severe stress which may be produced at the moment of firing, due to the force of the explosion, and which, if no provision were made for permitting movement of the gun upon or about its trunnions without moving the elevating-gear, might injure such gear, the cones 0, which turn with the shaft a, slip in the wheels 6 f, so that no injurious shock or jar is imparted to the operating mechanism.

NVhat I claim is 1. The combination, with a shaft to which rotary motion is to be imparted, of a spurwheel mounted upon the said shaft, a wormwheel formed with or firmly attached to the said spur-wheel, an operating-shaft, and gearwheels connecting the said spur-wheel and worm-wheel with the said operating-shaft, whereby the said wheels may be rotated simultaneously through both sets of gearing.

2. The combination, with a shaft connected by gearing with an elevating-arc on a gun, of a spur-wheel mounted upon the said shaft, a worm-wheel formed with or firmly attached to the said spur-wheel, an operating-shaft, and gear-wheels connecting the said spur-wheel and worm-wheel with the said operating-sh aft, for the purpose above specified.

3. The combination, with a shaft connected by gearing with an elevating-arc on a gun, of a spur-wheel mounted upon the said shaft, a worm-wheel formed with or firmly attached to the said spur-wheel, friction-cones keyed upon the said shaft and arranged to be held in frictional contact With the said wheels, an operating-shaft, and gear-wheels connecting the said spur-wheel and worm-wheel with the said operating-shaft, substantially as and for the purposes set forth.

4. The combination, with the shaft a, connected by gearing with the elevating-arc d, of

the spur-wheel f and worm-wheel e, firmly united and mounted upon the said shaft, the operating-shaft Z, the pinion n, fixed upon the said operating-shaft and geared with the spurwheel f, the worm g, geared with the said worm-Wheel, and bevel-wheelsj k, connecting the worm-shaft h with the said operating-- shaft, substantially as and for the purposes set forth.

5. The combination, with the shaft a, connected by gearing with the elevating-arc d, of the spur-wheel f and worm-wheel e, firmly united and mounted upon the said shaft, the friction-cones 0, keyed upon the said shaft and fitting into conical recesses in the said wheels, the nuts a on the said shaft a for holding the said cones in frictional contact with the said -wheels, the operating-shaft Z, the pinion n,

fixed upon the said operating-sh aft and geared with the spur-wheel f, the worm g, geared with the said worm-Wheel, and bevel-wheels j k, connecting the worm-shaft h with the said operating-shaft, substantially as and for the purposes set forth.

In testimony whereof I have hereunto signed my name in the presence of two subscribin witnesses. 4.-

JEAN BAPTISTE GUSTAVE ADOLPHE (JANET.

lVitnesses:

R. J. PRESTON, JOHN H. R. WHINFIELD. 

